India's statistical system and data sources today

Detail

Where these sources fit in the NCERT data framework

• Primary data is data a researcher collects first-hand, through observation, interviews, questionnaires or schedules.
• Secondary data is data that someone else has already collected and published.
• NCERT lists the Census of India, the National Sample Survey (NSS) reports and the weather reports of the IMD (India Meteorological Department) as government publications. These are a main type of secondary data.
• India's official data comes from two kinds of exercise:
• A census is a complete count. Every unit (person, house, farm or animal) is counted.
• A sample survey is a study of a small, scientifically chosen part (a sample). The results are then scaled up to estimate the whole country.

Feature	Census	Sample survey
Coverage	Every unit	A chosen sample
Frequency	Rare: every 10 years (population) or every 5 years (agriculture, livestock)	Frequent: yearly, quarterly or monthly
Cost and time	Very high	Lower
Main use	Small-area data (village, ward), a frame for choosing samples	Quick estimates of jobs, consumption, health
Examples	Census of India, Agriculture Census, Livestock Census	NSS, PLFS, HCES, NFHS

Census of India

• Census of India: the count of every person in the country, together with their housing, amenities, literacy, work, migration and other social details.
• Timeline:
• 1872: the first count. It was non-synchronous, meaning it was not held everywhere at the same time.

• Since 1881: synchronous, meaning it is held across the country on the same dates, and repeated every ten years without a break.

• Legal and administrative base:

• It is run under the Census Act 1948.
• It is led by the Registrar General and Census Commissioner of India, who works under the Ministry of Home Affairs (MHA).

• The government states its intent to hold a census by notification in the official gazette under Section 3 of the Census Act 1948 [2].

• The 2021 round was postponed. The next count is Census 2027.

• Census 2027 reference dates. A reference date is the exact moment the count describes. Every person is recorded as on that moment.
• Most of India: 00:00 hours, 1 March 2027 [2].
• Snow-bound areas: 00:00 hours, 1 October 2026. This covers the UT of Ladakh and the non-synchronous snow-bound areas of the UT of Jammu and Kashmir, Himachal Pradesh and Uttarakhand [2].

• Why the snow-bound areas count earlier: heavy snow in March blocks the high Himalayan villages, so enumerators cannot reach them.

• Two phases [2]: 1. Houselisting and Housing Census: houses, amenities and assets. 2. Population Enumeration: details of every person.

• Caste enumeration: the Cabinet Committee on Political Affairs decided on 30 April 2025 to include caste in Census 2027. Caste will be counted in full during the Population Enumeration phase [2].

• First digital census: data is collected through mobile apps, so results can come out faster [3].
• Self-enumeration: households can fill in their own details online. In Meghalaya this began on 1 May 2026 [4].
• Census results (density, sex ratio, literacy, urbanisation) are covered in india-population.

National Sample Survey (NSS) and the National Statistics Office (NSO)

• National Sample Survey (NSS): a set of nationwide household and enterprise surveys, held in "rounds" since 1950.
• It was set up under P.C. Mahalanobis, the statistician who founded the Indian Statistical Institute.

• It covers consumption, employment, health, education, housing and other social and economic topics.

• National Statistics Office (NSO): India's main statistics body. It was formed in 2019 under the Ministry of Statistics and Programme Implementation (MoSPI) by merging two offices:

• CSO (Central Statistics Office): compiled national accounts and indices.

• NSSO (National Sample Survey Office): ran the field surveys.

• Main NSO outputs:

Output	What it measures	Key facts
PLFS (Periodic Labour Force Survey: a regular survey of jobs and unemployment)	Labour force, employment, unemployment	Started 2017-18. Monthly estimates began in January 2025. The first monthly bulletin (for April 2025) was released in May 2025 [5]
HCES (Household Consumption Expenditure Survey: what households spend each month)	Living standards, poverty and inequality, weights for price indices	Held back to back in 2022-23 and 2023-24. The 2023-24 factsheet came out on 27 December 2024 and the full report on 30 January 2025 [6][7]
National accounts	GDP, GVA (gross value added)	Compiled by NSO (see economic-data-statistics)

• HCES 2023-24 results [6]:
• MPCE (Monthly Per Capita Consumption Expenditure: average spending per person per month) was ₹4,122 in rural India and ₹6,996 in urban India.
• After adding the value of free items from welfare schemes (such as free ration), MPCE rises to ₹4,247 (rural) and ₹7,078 (urban).
• The urban–rural gap in MPCE narrowed from 84% (2011-12) to 71% (2022-23) and then 70% (2023-24).

Sectoral censuses

• Agriculture Census: a count of operational holdings held every five years since 1970-71. It records the number and size of holdings, how the land is held (tenure) and how it is used.
• Operational holding: all land used wholly or partly for farming and run as one technical unit by one person, alone or with others. Who owns the land (title), its legal form, size and location do not matter [8].
• The 11th Agriculture Census (2021-22) was the first to use smartphones and digitised land records.
• Size classes [8]:

Class	Size of holding
Marginal	Below 1.00 ha
Small	1.00–2.00 ha
Semi-medium	2.00–4.00 ha
Medium	4.00–10.00 ha
Large	10.00 ha and above

• Livestock Census: a count of all domestic animals and poultry, by species and breed. It has been held since 1919-20.
• 20th (2019): about 536 million livestock.
• 21st: launched across India on 25 October 2024 and planned to finish by 31 March 2025. It covers more than 30 crore households in all States and UTs [9][10].
• New in the 21st census: it is the first to give separate data on livestock held by pastoralists (herders who move with their animals, often transhumance: seasonal movement between hill and plain pastures). This makes nomadic herding systems visible in official data [9].

Other key data sources

• NFHS (National Family Health Survey): a sample survey on health, fertility, nutrition and family planning.
• It is run by the Ministry of Health and Family Welfare with the International Institute for Population Sciences (IIPS), Mumbai.

• The latest round is NFHS-5 (2019-21).

• IMD (India Meteorological Department): India's official source of weather and climate data, such as rainfall, temperature and cyclone records.

• data.gov.in (Open Government Data Platform): an online portal where ministries publish their datasets openly.
• It works under the National Data Sharing and Accessibility Policy (NDSAP) 2012. Under NDSAP, non-sensitive public data should be shared in machine-readable form.

Issues with official statistics

• Delays.
• Census 2021 was pushed to 2027. Until then, planners still use Census 2011 figures and the old sample frame.

• A sample frame is the list of households or villages from which samples are drawn. If it is old, the samples can become biased.

• Comparability across rounds. When survey methods change, old and new numbers cannot be compared cleanly.

• Example: the PLFS design changed in 2025 [5].

• Example: HCES 2022-23 used a new questionnaire design.

• Debates over sample design. Critics question sample size, whether the sample is representative, and how free items from welfare schemes are valued (see the two MPCE figures above [6]).

• Credibility of official numbers. Experts and the public need to trust the data. This depends on independent statistical bodies, release calendars announced in advance, and open access to unit-level data.

Prelims Hooks

• Census: first count in 1872 (non-synchronous). Synchronous every ten years since 1881. Legal base: the Census Act 1948. Run by the Registrar General and Census Commissioner, under the MHA (not MoSPI).
• Census 2027 reference date: 1 March 2027. For Ladakh and the snow-bound parts of J&K, Himachal Pradesh and Uttarakhand, it is 1 October 2026 [2].
• Census 2027 is India's first digital census. Caste enumeration was approved by the CCPA on 30 April 2025 [2][3].
• NSS started in 1950 under P.C. Mahalanobis. NSO was formed in 2019 by merging the CSO and NSSO under MoSPI.
• PLFS started in 2017-18. Its first monthly bulletin was for April 2025 [5].
• HCES 2023-24 MPCE: rural ₹4,122, urban ₹6,996. The urban–rural gap fell from 84% (2011-12) to 70% [6].
• Agriculture Census: every 5 years since 1970-71. Size classes: marginal below 1 ha, small 1–2 ha, semi-medium 2–4 ha, medium 4–10 ha, large 10 ha and above [8].
• Livestock Census: since 1919-20. The 20th (2019) counted about 536 million animals. The 21st began on 25 October 2024 and is the first with separate data on pastoralists [9].
• NFHS is run by MoHFW with IIPS Mumbai. NFHS-5 covers 2019-21. data.gov.in works under NDSAP 2012.
• Trap: in NCERT, the Census, NSS and IMD reports are secondary data sources (government publications), not primary ones.

Mains Points

• Old data hurts planning (GS-I/GS-II).
• The delayed Census leaves Census 2011 as the base.
• This weakens population projections, delimitation of seats, the National Food Security Act coverage and urban planning.
• It also leaves sample frames out of date for NSS surveys.

• Census 2027 being digital, with self-enumeration and caste data, may give faster and more detailed small-area data [2][3].

• Better survey frequency is a reform (GS-III).

• PLFS now gives monthly labour data [5], and HCES was run in two years back to back [6][7].
• Labour and consumption data now come out more often, which helps track jobs and poverty.

• The cost: changes in method break comparisons over time.

• Data on agrarian structure (GS-I/GS-III).

• The Agriculture Census size classes [8] show that holdings are mostly marginal and small.

• Linking this data to digitised land records helps target schemes and plan for land fragmentation.

• Data on pastoral economies (GS-I).

• Separate data on pastoralists in the 21st Livestock Census [9] makes nomadic herding visible in official numbers.
• Herders in the Himalaya, Rajasthan and the Deccan have long been left out of policy.
• With this data, grazing rights, breed conservation and climate-adaptation planning can include them.